Etymotic Research
Etymotic ER4 SR/XR Noise-Isolating Earphones
Best in-ear monitors for studio professionals and critical audiophiles.
Experience unparalleled audio accuracy with the Etymotic ER4 SR/XR Noise-Isolating Earphones. Designed for studio professionals and discerning audiophiles, these wired in-ear monitors utilize high-performance balanced armature drivers for precise sound reproduction. The ER4SR model offers a flat, reference-tuned response, ideal for critical listening and mixing, while the ER4XR provides a subtle bass enhancement for a more engaging listening experience. Crafted from anodized aluminum with a slim, ergonomic design, they deliver exceptional passive noise isolation, blocking out ambient sound for immersive audio. The detachable, reinforced cable ensures durability and ease of use, making these earphones a top choice for accurate sound.
$299.95
Owner Satisfaction
4.5
/ 5
Category Rank
791
/ 6142
#791 in Headphones
Price vs Category Average
-49%
Below average
Frequency Response
2016
/ Hz – kHz
Who it's for
- Commuters and remote workers needing distraction-free environments
- Audiophiles seeking clinical accuracy and transparent sound reproduction
- Daily listeners prioritizing long-term hardware durability
Who should skip it
- Users with sensitive ear canals or aversion to deep insertion
- Listeners who prefer an expansive, concert-hall soundstage experience
- Active users who frequently move while wearing their earphones
Performance breakdown
Audio Accuracy
Reference-grade tuning delivers clinical, uncolored sound for critical studio analysis.
Noise Isolation
Industry-leading passive seal effectively silences the loudest ambient environments.
Build Durability
Anodized aluminum housing and reinforced cables ensure long-term professional reliability.
Ergonomic Comfort
Deep-insertion fit provides stability but requires adjustment for extended listening sessions.
Maintenance Ease
User-replaceable filters and detachable cables significantly extend the product's lifespan.
Versatility
Specialized tuning excels for monitoring but lacks modern consumer-friendly wireless features.
Key Specs
Frequency Response
20 Hz – 16 kHz
Transducers
Single high-performance balanced armature per channel
Noise Isolation
35dB (silicone tips), 42dB (foam tips)
Impedance
45 Ohms
Sensitivity
98 dB @ 1kHz, 1mW
Maximum Output (SPL)
122 dB
Cable
Detachable reinforced, twisted 5 ft with MMCX connectors
User Replaceable ACCU-Filters
Yes
Features
- High-performance balanced armature drivers
- Choice of Reference (SR) or Extended Response (XR) tuning
- Class-leading passive noise isolation
- Durable anodized aluminum construction
- Slim and comfortable in-ear design
- Detachable, reinforced cable with MMCX connectors
- User-replaceable filters protect drivers
- Comprehensive accessory kit included
What customers say
Customers consistently laud the Etymotic ER4 SR/XR earphones for their exceptional sound quality and unparalleled noise isolation. Users frequently highlight the precise, neutral audio reproduction, making them a favorite for critical listening. The deep insertion design, while providing superb passive noise blocking, requires some adaptation for optimal comfort and fit. Despite this, the clarity and detail of the sound profile are overwhelmingly praised, establishing these earphones as a benchmark for audio fidelity and an excellent choice for immersive listening in noisy environments.
Know before you buy
The ER4SR (Studio Reference) is tuned for a completely flat, neutral sound profile ideal for mixing and critical listening. The ER4XR (Extended Response) features a slight bass boost, providing a warmer, more engaging sound signature while maintaining the same level of detail.
These earphones offer industry-leading passive noise isolation, blocking between 35dB and 42dB of ambient sound depending on whether you use the included silicone or foam tips. This makes them highly effective for commuting, travel, or working in noisy environments without needing active noise cancellation.
Yes, the earphones feature a detachable, reinforced cable that uses standard MMCX connectors. This allows you to easily replace the cable if it becomes damaged or if you prefer to use a third-party cable.
With an impedance of 45 Ohms, these earphones can be driven by most smartphones, laptops, and tablets. However, using a high-quality DAC or amplifier can help you get the most out of their resolution and clarity.
The ACCU-Filters are small, user-replaceable filters located at the nozzle of the earphone that prevent earwax and debris from entering and damaging the delicate balanced armature drivers. Replacing them periodically is essential for maintaining consistent sound quality and protecting your investment.
No, the ER4 SR/XR models do not include an integrated microphone or remote controls. They are designed specifically for high-fidelity audio playback and professional monitoring.
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$300